feat(frontend): add API client, layout, and routing

- Create Axios-based API client with sources, jobs, and dashboard endpoints
- Add responsive Layout component with navigation sidebar
- Set up React Router with Dashboard, Backups, and Settings routes
- Configure TanStack Query provider with default options
- Use lucide-react for navigation icons

frontend/node_modules/lucide-react/dist/esm/icons/move-diagonal.js

@@ -0,0 +1,17 @@
+/**
+ * @license lucide-react v0.303.0 - ISC
+ *
+ * This source code is licensed under the ISC license.
+ * See the LICENSE file in the root directory of this source tree.
+ */
+
+import createLucideIcon from '../createLucideIcon.js';
+
+const MoveDiagonal = createLucideIcon("MoveDiagonal", [
+  ["polyline", { points: "13 5 19 5 19 11", key: "11219e" }],
+  ["polyline", { points: "11 19 5 19 5 13", key: "sfq3wq" }],
+  ["line", { x1: "19", x2: "5", y1: "5", y2: "19", key: "1x9vlm" }]
+]);
+
+export { MoveDiagonal as default };
+//# sourceMappingURL=move-diagonal.js.map